<template>
  <div>
    <div class="father" @click="iddJsj">
      <div class="box" :class="{ active: id === '1' }">1</div>
      <div class="box" :class="{ active: id === '2' }">2</div>
      <div class="box" :class="{ active: id === '3' }">3</div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      id: '',
    }
  },

  methods: {
    iddJsj(e) {
      this.id = e.target.innerHTML
    },
  },
}
</script>

<style scoped>
.box {
  border: 1px solid #333;
  width: 250px;
  height: 250px;
}
.father {
  display: flex;
}
.active {
  background-color: #087;
}
</style>
